The fixator is one of many muscles used during situps. The fixator muscle stabilizes one part of your body when you move another part.
Sit-ups work the abdominal muscles, particularly the upper abs.
You use your abdominal muscles to do sit ups.
deltoids
i think is the deltoid muscle but I'm not sure tbh
ur abs
Sit ups are an anaerobic exercise, which means that this type of exercise does not help in losing weight. Anaerobic exercises are used to build muscle and can actually cause an increase in weight because muscle weighs more than fat.
you can do lots of sit ups, it will strengthen your back and abdominal muscle!
Rectus abdominus Internal and external obliques Transversus abdominus.
Steadily increase the amount and sit-ups and do multiple sets, or you could try other ab exercises with a medicine ball.
Sit-ups will work out your abdominal muscles.
you can make your upper body more muscle by doing sit ups bench press push ups or any thing like that
Cardiac
Working out is the best answer, You should do 10 to 50 push ups a day and 10 to 20 sit ups every day.Hope that helped ???
by doing various exercises such as sit ups and running and u can go to the gym
Push ups and sit ups help alot. Also lots of cardio and pull ups. PLus running and riding bikes